Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24b2a87fb85c342…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 12:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76e6cb8cacef7a36afb8215390443a6b SHA-1: 087d5d8851909e14fa2eab7f15401b7ea942ce48 SHA-256: f24b2a87fb85c34289b08aeeba46ef80624fdd66eb71df6f3a5f6f41bd8eba69
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, many of which point to disposable hosting services or known malicious redirectors. The primary malicious URL identified is dafemum.ru, which is flagged as a redirector. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=ancient+christian+commentary+on+scripture+matthew In PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/rekevomiwipa.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/zukowepamis.pdfIn PDF document text
    • https://wulaludotesi.weebly.com/uploads/1/3/0/9/130969185/lukuli.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/sebodatij.pdfIn PDF document text
    • http://suzodibolo.22web.org/63887124201.pdfIn PDF document text
    • http://davavemoj.66ghz.com/sparkle_background_free.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/55967679426.pdfIn PDF document text
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/9037633.pdfIn PDF document text
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/33684.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/2734557.pdfIn PDF document text
    • https://gofubajub.weebly.com/uploads/1/3/4/6/134632898/foxatomajiwesi.pdfIn PDF document text
    • http://samekado.22web.org/nptel_civil_engineering_design_of_concrete_structures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_19c56940d30246e9ace09236cafab346.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3f16a8-9ebb-4a34-bff4-05dd4419f010/vocabulario_de_teologa_bblica_leon_dufour_gratis.pdfIn PDF document text
    • http://nivigiwaragere.epizy.com/greatest_common_factor_worksheet_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574b0eba-6e68-4db8-b5ac-064b9b5dfe82/mass_communication_living_in_a_media_world_5th_edition.pdfIn PDF document text
    • http://xileluzazisazit.epizy.com/why_is_my_sewing_machine_not_catching_the_bobbin_thread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810e7e53-4e31-4c1c-a2a8-6633fe20faf8/man_of_constant_sorrow_mandolin_chords_and_lyrics.pdfIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_c5900175b9ad49198bc5cceafc8d48ae.pdf?index=trueIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_6598db8ff6f5409e848b4ddfd8e43a8e.pdf?index=trueIn PDF document text
    • http://patuwovoparivi.rf.gd/limolowabovew.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_1338ad0b41a944198dbe63f069ae2b4f.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_e87a55c2889d4d1493fefc075361cc57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84314f44-28d1-4224-bace-c2815680e850/ff6_missable_monsters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20d3afe-ebb5-4bca-b08c-1bcc8f8f8ef9/how_do_i_cancel_my_lumin_subscription.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 5324 bytes
SHA-256: 611b295899253ab672cfa908472dc0b3f4c0aab34abce876ea06757853ddd3fe
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 10268 bytes
SHA-256: 50761117afa23d02d903e5197d763b16c68674b4a703588b39fccfc853cb0602